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Questions tagged [inductive]

In the context of electronics, inductive refers to circuits that use magnetic fields, for things such as power or data transfer or sensing metal objects

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13 votes
6 answers
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I keep blowing up irrigation solenoids

I built my own Wi-Fi connected irrigation controller using an Arduino Nano and some mechanical relays. The Arduino is opto-isolated from the business end of the relays which switch 24 V AC on/off to ...
Jim M's user avatar
  • 131
0 votes
0 answers
117 views

What is the best approach to switching heavy loads with parallel MOSFETs?

I am going to build a spot welder with 20 MOSFETs in parallel (datasheet), each one capable of delivering 550A (1.2 kA peak approx.) powered by 35 mm2 cables connected to a 60 Ah 12 V car battery. In ...
Roberto Tascioni's user avatar
0 votes
5 answers
147 views

Is there an equation to calculate the voltage spike caused by an inductor in the absence of a freewheeling diode?

I am using a 50V DC power supply to supply an inductive load of 10mH (any kind of inductive load.) I am using a MOSFET as a low side switch. If I do not use a freewheeling diode to discharge the ...
Sudhanva Gokhale's user avatar
0 votes
1 answer
45 views

Diodes selection for High Side switch protection against inductive load

Hello I would like to design protection for HSD, BTS7200-2EPA against inductive load. Spec data for the inductive load is limited. But the PCB was designed for 2.5A peak, and approximate L and R_L ...
min_c's user avatar
  • 1
0 votes
2 answers
91 views

Do 12V fans for cooling a chassis commonly need external flyback diodes?

I'm building an electronics controller. I have a chassis with a 12VDC cooling fan. It seems to me that a fan might present an inductive load to the ACDC power supply it's connected to, so I'm trying ...
Open_Hamster3337's user avatar
2 votes
6 answers
2k views

Simplest way to isolate MOSFET from MCU

I want to switch a 220 V AC motor which is an inductive load with a relay which is controlled by an MCU. I've taken precautions for arcing with a TVS diode on the contacts side, but I still want to go ...
CaveScientist's user avatar
2 votes
4 answers
841 views

DC motor voltage kickback when turning off

newbie here. I'm having some problem with my DC motor circuit. As you can see from the image above, voltage does not drop off quickly when it's turned off. I understand that the sudden spike is due ...
Yoonki's user avatar
  • 21
0 votes
1 answer
67 views

How to convert this 220V AC input inductive charger to 127V AC input?

My friend bought a device that has wireless charging, but in my country, in the region I live, the AC voltage is 127V , and she received (a long ago) by mistake a 220V AC input version. She never got ...
Rodrigo's user avatar
  • 567
0 votes
1 answer
79 views

Ironing out a design for resonant inductive coupling on 13A. Would I be better off with MHz or GHz for efficient power transfer?

I am having a go at designing an extension cord that uses resonant inductive coupling. My knowledge lacks in this area, so I'm going back and forth via online research & chatgpt 3.5. From what I ...
Dragonfly3r's user avatar
0 votes
1 answer
58 views

Overcurrent protection for solenoid switch

I'm trying to replicate a circuit that switches couple of inductive solenoid switches at ~65 V but having some occasional destructions on my MOSFETs. I also added an overcurrent protection using a ...
Berkays's user avatar
  • 179
0 votes
2 answers
91 views

Charging and discharging electro-magnet

I was using normal MOSFET to turn a 1.2 H+4.8 Ω electro magnet at 48 V and draw around 10 A. The MOSFETs are getting damaged after a few days. The MOSFET is just used as a switch (no continuous ...
Jim's user avatar
  • 51
4 votes
1 answer
198 views

Eliminating a weird pulse when switching a valve actuator using a low-side MOSFET

The circuit is connected as drawn below: MOSFET IC = MAX14919A Valve actuator = MHE2-MS1H-3/2G-M7-K Schottky Diode = SS16HL-TP The pulse happens when the low-side MOSFET opens (disconnecting the ...
KevinZ's user avatar
  • 43
3 votes
1 answer
204 views

Is it possible to "relay" a wireless (inductive) charger using two coils?

I'm on a quest to have an iPhone wallet case that supports wireless charging. I won't bore you with my long list of failures, but would love feedback on this strategy. I 3d printed a case which puts a ...
bendytree's user avatar
2 votes
1 answer
158 views

MOC3041 typical SSR circuit, when snubber is applied, triac never turns off

I am trying to make this circuit: I got reference from this site, which is very useful, thanking them for info; https://components101.com/ics/moc3041-zero-cross-triac-driven-optoisolator Despite all ...
Amol Vaidya's user avatar
1 vote
0 answers
57 views

Mixing power supplies with inductive loads

I have two unregulated power supply - 24V and 12V. My board consists of digital components and sensors that require 3.3V or 5V. All that electronics is resposible for electromagnets or DC brush motors ...
pajur97's user avatar
  • 11
5 votes
2 answers
2k views

Can wireless charging become more energy efficient?

I've stumbled upon a few articles saying that wireless charging takes more energy to charge something compared to the cable. Like this one. Like in the test from the article, it takes 47.33 % more ...
Maltoon Yezi's user avatar
1 vote
0 answers
182 views

Do I need a snubber in a snubberless triac?

I am trying to make this circuit and using the Triac as a switch. I am using in this one a BTA06, although I will upgrade it to a BTA12 so it can handle 220 V 1000 W easily. It will be implemented in ...
Hazardous Voltage's user avatar
0 votes
1 answer
64 views

Can we replace transformer in the DAB converter with some inductor model [closed]

I am currently working on analyzing the behavior of GaN MOSFETs in a Dual Active Bridge (DAB) converter for a battery charging application. The DAB converter requires a transformer for isolation and ...
Fame313's user avatar
  • 75
5 votes
4 answers
1k views

Would a room-sized coil used for inductive coupling and wireless energy transfer be feasible?

My understanding of inductive coupling is that it isn't feasible over long distances because the spread of the magnetic field lines happens rapidly, so not much flux will go through the receiver coil ...
Whelchel's user avatar
  • 153
0 votes
2 answers
73 views

Inductive crosstalk mechanism for 2 lines that run parallel on the same layer

According to Faraday's law, changing magnetic field lines that penetrates the victim line must create voltage on the victim line, but if we imagine, we see lines are orthogonal to the victim trace ...
dsplover123's user avatar
0 votes
2 answers
76 views

Why is the current limited to 0.8A while switching this inductive load?

How can I increase the current in this setup? I tried increasing the gate on pulse and the inductance (L) but couldn't achieve a higher current. Any other suggestion on this?
Rohan Kharvi's user avatar
0 votes
2 answers
182 views

Driving a solenoid via a digital output

What are the effects of the pull-down resistor (33K) when the solenoid-valve enters its turn-off phase? Will it prevent the solenoid-valve from ever discharging because current would flow from ground ...
user2063586's user avatar
2 votes
3 answers
151 views

If the impedance of two coils is measured to be identical at 250.0 kHz, is it safe to assume identical impedance across the spectrum?

This question pertains to matching two air-gap inductors for use in resonant coupling. Alternative solutions are welcomed and appreciated. The two coils shall be comprised of identical wire. The two ...
Aaron Butkovich's user avatar
0 votes
1 answer
185 views

High side switch with inductive loads

Seeking help with the following datasheet. Section 9.4.3 Didn't understand the above calculations. It states that for inductive load energy dissipation, the energy from the source and the load is ...
Harkirat's user avatar
  • 121
1 vote
0 answers
108 views

Low-side push-pull transistor of MOSFET gate driver damaged

I have a buck converter as shown in the given figure (48 V output): At rated loads the buck converter operates correctly as expected. When I test the circuit with the over-current and the short-...
Ishani Engineeŕ's user avatar
0 votes
1 answer
208 views

Inductive proximity sensors: size vs. sensitivity

My target is a 20mm long, stainless steel, socket head, M3 screw with head facing the sensor. How will sensor sensitivity, i.e. maximum sensing distance, change with different sensor size? I'm looking ...
Paul Jurczak's user avatar
1 vote
5 answers
751 views

I want to know if the following circuit is inductive or capacitive. What is the difference between inductive and capacitive?

I want to know if the following circuit is inductive or capacitive? What is the difference between inductive and capacitive?
I am LOSER's user avatar
1 vote
1 answer
133 views

Can a contactor give an inductive kickback?

I have a ZBMINI (not -L) and use it to toggle my heating (2kW). In between I put a contactor because I trust it to be more safe. The problem is that sometimes it toggles a few times extra. Depending ...
geiregjo's user avatar
2 votes
1 answer
460 views

Is this caused by inductive kickback?

I have a remote controlled switch that's connected to a bathroom fan (220v AC, 50Hz). The switch turns the fan on without issues every time. However, when instructed to turn it off, it immediately ...
Khash's user avatar
  • 123
1 vote
0 answers
113 views

Calculate or estimate 3-phase 400V heat pump (inductive) load

My water heating system (CTC) consist of a air-to-water heat pump and a water tank with an immersion heater. It is all powered from the same electronics pack and hooked up to 400V (3-phase) with a 25A ...
2jan's user avatar
  • 11
2 votes
1 answer
156 views

MOSFET problem in H-Bridge circuit

I'm trying to switch the latching solenoid on and off with an H-bridge circuit (see figure). Components I use in this circuit: P-MOS , N-MOS , NPN I've run this circuit a few times with no problems, ...
harmonica's user avatar
  • 673
3 votes
0 answers
116 views

Stability simulation - breaking the loop for a MOSFET - op-amp current source

The task at hand is to create a voltage controlled current source of 60 mA driving a valve coil (64 mH, 139 Ω). I am aware the MOSFET used is insufficient powerwise; it was a quick attempt to have a ...
Hyp's user avatar
  • 877
1 vote
1 answer
78 views

Issue with liquid level sensing circuit with LDC0851 chip

I came across a video where TI demonstrates liquid level sensing via an inductive switch. I am trying to recreate this and understand the circuit they made. A forum provided this schematic: Below I ...
Josh's user avatar
  • 11
0 votes
0 answers
73 views

Magnetic charging

I have a question about magnetically charging devices and would like to see if anyone can help. I understand we have things like cell phone chargers that wirelessly charge using inductive technology, ...
Billy Duffy's user avatar
0 votes
1 answer
219 views

How to drive an induction hob coil from AC mains

I have been looking into designing an induction hob circuit, but haven't really found complete answers to my questions. As I understand it, it's important to take advantage of the natural resonant ...
Rocketmagnet's user avatar
  • 27.5k
1 vote
0 answers
56 views

Ringing seen when charger is presented to DUT

The following is my setup: Charger is set to 56V and 15A. When charger is turned on there is significant ringing measured by the probe directly at the charger terminals. However this ringing is ...
Hasman404's user avatar
  • 757
0 votes
1 answer
484 views

Best PCB relays for inductive loads

The questions: What should I look for when searching for a PCB relay to drive inductive loads? Any tips on how I could find relays like that (digikey, etc do not allow you to filter by snubber, ...
Carlos Garcia's user avatar
0 votes
1 answer
144 views

Switching an active inductor controller with a high-side MOSFET [closed]

I need help switching an active inductor controller using inductive reactance to control the current of two feeds. The circuit I have built uses make-before-break switching just like a rotating brush ...
Marathonman's user avatar
2 votes
2 answers
525 views

Sizing a RC Snubber - microcontroller restarting when switching off an inductive load

I'm trying to drive an 220 V solenoid water valve with a relay, but I'm having problems: when I turn off the solenoid, the microcontroller reboots. I believe the source of the problem is the spike ...
Artur Zahn's user avatar
-1 votes
1 answer
49 views

Line to Line voltage in a three phase circuit with three loads

So the first load is a balanced, purely resistive one. The second one is unbalanced, and the third one is balanced. Diagram looks like this For the first load, I'm expecting to get line to line ...
anndress07's user avatar
-1 votes
2 answers
216 views

Inductive load turns on PC mouse RGB

I have a floor fan connected on the same outlet as my PC. When the PC is off, if I turn on or turn off the fan the mouse RGB lights up for a split second. The mouse is plugged in to a USB port that ...
Infinity98's user avatar
0 votes
1 answer
178 views

PWM solid state relay output not well modulated with inductive load

I am attempting to control the current through a generator rotor by adjusting PWM input to a DC to DC solid state relay (SSR), specifically a TWTADE SSR-40DD. The power supply for the output side of ...
user156904's user avatar
0 votes
1 answer
213 views

Inductive or capacitive load?

Here I have a series LCR circuit with resonant frequency greater than 200Hz. Is there a way to know whether this circuit is an inductive or a capacitive load? Edit: The only additional information we ...
DINEDINE's user avatar
  • 103
0 votes
1 answer
636 views

How does balancing currents within a cable or conduit cancel its magnetic fields?

I know the NEC requires all current carrying conductors of the same circuit to be included in the same cable or conduit [300.3(B)], but why? I think it is because the magnetic field generated by ...
Nicknamednick's user avatar
1 vote
1 answer
722 views

How can the induced voltage be proportional to the frequency?

According to Faraday's Law, in coupled inductors, the magnitude of the induced voltage at the secondary coil is proportional to primary power source's frequency (V2 = w x I1 x M). On the other hand, ...
ilyas's user avatar
  • 41
3 votes
2 answers
613 views

Why does the quality factor include 2*pi?

The quality factor is defined as the ratio of stored energy and dissipated energy (see below). The formula includes \$2\pi\$ as a constant coefficient. Why do we need \$2\pi\$ to calculate the stored ...
ilyas's user avatar
  • 41
0 votes
0 answers
264 views

Antenna inductance calculation (RFID applications, inductive coupling)

Inductance of various antenna coils of different shapes can be estimated. Some examples are: A circular coil with single turn. N turn multilayer circular coil. Spiral coil. N turn squae loop coil. ...
Ethz's user avatar
  • 1
1 vote
4 answers
1k views

Why inductive load heats up on modified sine wave inverter?

What makes the inductive load like a motor heat up when used on a modified sine wave inverter. Is it because of the back emf caused by sudden drop of voltage by the square wave?
kuchi's user avatar
  • 121
0 votes
1 answer
354 views

Can inductive sensors work on anodized aluminum?

I was wondering if an industrial-grade inductive sensor can detect an anodized aluminum plate. From what I know, based on the working principle of these sensors (basically the metal is detected by its ...
Pedro Germán's user avatar
0 votes
0 answers
2k views

Are SSR Relays suitable for inductive and capacitive loads?

I want to knowingly buy a cheap knockoff SSR Realy from some online sellers. The SSR Relay is advertised as not to be used for inductive or capacitive loads. My application is switching on or off a ...
DEKKER's user avatar
  • 775

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